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I am having a 1Tb external harddisk. Its working perfectly fine on ubuntu and windows. But On mac its read-only. How can I change this.

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With what filesystem is the HD formatted? NTFS? – Patrick May 28 '11 at 7:31
If the exHDD is NTFS formatted, you can use either [ntfs-3g(free)][1] or NTFS for Mac([]). [] – karmatic May 28 '11 at 7:53
up vote 3 down vote accepted

Your external drive is most probably formatted on Windows and is then in NTFS format. Check this question which will give you the different possibilities you have.

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